All 50 of the Boeing 787 Dreamliner jets in service around the world remain grounded while investigators continue to look for the cause of battery problems that forced the planes to be parked in January.

U.S. investigators are poring over microscopic evidence looking for what might have caused overheating and fires that caused problems for Boeing's most advanced aircraft, Bloomberg said.

The planes were grounded on Jan. 16 after an All Nippon Aiways 787 made an emergency landing because its lithium-ion battery smoked and was charred, Bloomberg said. The grounding could go on for an extended period unless a cause is found soon, Bloomberg said.

The 787 is a key element to plans for many airlines, including Fort Worth-based American Airlines, which has ordered 42 of the planes and announced on Jan. 14 that it was moving up delivery of the first jet in that order.

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